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*A;W <br /> Mr. Infurna <br /> October 10, 1996 <br /> Page 2 <br /> conducted at the Site may have caused significant DCA <br /> contamination in the groundwater beneath the Site. <br /> Furthermore, the presence of elevated DCA <br /> concentrations in the upgradient monitoring well <br /> indicate that additional sources located to the north <br /> of the Site may have contributed to the contamination.. <br /> Based on the groundwater flow directions, DTSC believes <br /> that the DCA contaminated groundwater mayhave migrated <br /> off Site. <br /> DCA is an industrial solvents and has also. been <br /> used as lead scavenger in antiknock gasoline. It is <br /> listed as a confirmedcarcinogen by both the State and <br /> Federal Environmental Protection Agencies. DCA may <br /> also cause dermatitis, edema of the lungs, toxic <br /> effects on the kidney, and severe corneal effects. <br /> Experimental data alsoindicates that DCA may have <br /> teratogenic and reproductive effects. Human mutation <br /> data have also been reported. The State Maximum <br /> :Contamination Level (MCL) for DCA in the drinking water <br /> 1a :0 .5 ug/l. In addition to DCA, elevated PCE and TCE <br /> at levels exceeding the State MCL of 5 ug/1 were <br /> detected in the. monitoring wells, MW#1, MW#2, :MW#3,.,. and <br /> .MW#5...:.. However,. the PCE contamination may have been <br /> from .an. off-Site source. <br /> Based on phone conversations with you AtdMr:. <br /> Brathovde, DTSCunderstands that upon determining allno <br /> further action required" , the County would have:. to <br /> proceed with regulatory closure for the Site and the <br /> five monitoring wells would have to be destroyed. <br /> However, in view of the levels of DCA and other VOCs; <br /> detected in. the groundwater beneath the Sitel the f -V.L- <br /> V— <br /> monitoring wells are necessary to be remained open and <br /> .a.ampling activities for the VOCs must continuel:.- A 1{:no <br /> .:f.Urt.�her action,, determination can only be :made if the <br /> P.C& and. other: volatile 9 ani,c compounds found in the: <br /> groundwater <br /> Water have been, remediated. <br /> Because th.e :5 t. .. may be a source for the DCA <br /> detected inthe.. grodhdwater, pursuant to. both. Stateand <br /> Federal law:, the :former owner and operator of the. <br /> .Texaco Service Station and existing owner andoperator <br /> of the prsperty are potential responsiblepartiesand <br /> Are required to investicrate and remediate the <br /> donta mated. Soil and groundwater. Theya.-re. also <br /> ±e.aporils-lble: f.b. Of thesemoriitarng wells. : <br /> r maint-ainincr and monitoring <br />